Tweetable facts about Twitter's IPO, history and users

Twitter has redefined the way we communicate, get news and share tidbits of our lives. It has even been credited with starting a revolution or two. The company, based in San Francisco, announced Thursday that it intends to sell stock to the public for the first time. Naturally, it did it via a tweet.

Here are some quick facts about Twitter in 140 characters or less, the limit of tweets.